1 /*
2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #if 0
31 #ifndef lint
32 static char const copyright[] =
33 "@(#) Copyright (c) 1989, 1993\n\
34 The Regents of the University of California. All rights reserved.\n";
35 #endif /* not lint */
36
37 #ifndef lint
38 static char sccsid[] = "@(#)echo.c 8.1 (Berkeley) 5/31/93";
39 #endif /* not lint */
40 #include <sys/cdefs.h>
41 /*__FBSDID("$FreeBSD: src/bin/echo/echo.c,v 1.17 2004/04/06 20:06:46 markm Exp $");*/
42 #endif
43
44 #include "config.h"
45 #include <sys/types.h>
46 #ifndef _MSC_VER
47 #include <sys/uio.h>
48 #endif
49
50 #include <stdio.h>
51 #include <assert.h>
52 #include <errno.h>
53 #include <limits.h>
54 #include <stdlib.h>
55 #include <string.h>
56 #ifndef _MSC_VER
57 #include <unistd.h>
58 #else
59 #include "mscfakes.h"
60 #endif
61
62 #ifndef IOV_MAX
63 #define IOV_MAX 1024
64 #endif
65
66
67 /*
68 * Report an error and exit.
69 * Use it instead of err(3) to avoid linking-in stdio.
70 */
71 static void
errexit(const char * prog,const char * reason)72 errexit(const char *prog, const char *reason)
73 {
74 char *errstr = strerror(errno);
75 ssize_t cchIgn = 0; /* this is to shut up irrelevant warnings on linux. */
76 #ifdef _MSC_VER
77 int doserrno = _doserrno;
78 char szDosErr[48];
79 sprintf(szDosErr, " (doserrno=%d)", doserrno);
80 #endif
81 cchIgn += write(STDERR_FILENO, prog, strlen(prog));
82 cchIgn += write(STDERR_FILENO, ": ", 2);
83 cchIgn += write(STDERR_FILENO, reason, strlen(reason));
84 cchIgn += write(STDERR_FILENO, ": ", 2);
85 cchIgn += write(STDERR_FILENO, errstr, strlen(errstr));
86 #ifdef _MSC_VER
87 cchIgn += write(STDERR_FILENO, szDosErr, strlen(szDosErr));
88 #endif
89 cchIgn += write(STDERR_FILENO, "\n", 1);
90 (void)cchIgn;
91 }
92
93 int
kmk_builtin_echo(int argc,char * argv[])94 kmk_builtin_echo(int argc, char *argv[])
95 {
96 int nflag; /* if not set, output a trailing newline. */
97 int veclen; /* number of writev arguments. */
98 struct iovec *iov, *vp, *iovfree; /* Elements to write, current element. */
99 char space[] = " ";
100 char newline[] = "\n";
101 char *progname = argv[0];
102
103 /* This utility may NOT do getopt(3) option parsing. */
104 if (*++argv && !strcmp(*argv, "-n")) {
105 ++argv;
106 --argc;
107 nflag = 1;
108 } else
109 nflag = 0;
110
111 veclen = (argc >= 2) ? (argc - 2) * 2 + 1 : 0;
112
113 if ((iovfree = vp = iov = malloc((veclen + 1) * sizeof(struct iovec))) == NULL) {
114 errexit(progname, "malloc");
115 exit(1);
116 }
117
118 while (argv[0] != NULL) {
119 size_t len;
120
121 len = strlen(argv[0]);
122
123 /*
124 * If the next argument is NULL then this is this
125 * the last argument, therefore we need to check
126 * for a trailing \c.
127 */
128 if (argv[1] == NULL) {
129 /* is there room for a '\c' and is there one? */
130 if (len >= 2 &&
131 argv[0][len - 2] == '\\' &&
132 argv[0][len - 1] == 'c') {
133 /* chop it and set the no-newline flag. */
134 len -= 2;
135 nflag = 1;
136 }
137 }
138 vp->iov_base = *argv;
139 vp++->iov_len = len;
140 if (*++argv) {
141 vp->iov_base = space;
142 vp++->iov_len = 1;
143 }
144 }
145 if (!nflag) {
146 veclen++;
147 vp->iov_base = newline;
148 vp++->iov_len = 1;
149 }
150 /* assert(veclen == (vp - iov)); */
151 while (veclen) {
152 int nwrite;
153
154 nwrite = (veclen > IOV_MAX) ? IOV_MAX : veclen;
155 if (writev(STDOUT_FILENO, iov, nwrite) == -1) {
156 errexit(progname, "write");
157 free(iovfree);
158 return 1;
159 }
160 iov += nwrite;
161 veclen -= nwrite;
162 }
163 free(iovfree);
164 return 0;
165 }
166